Fog has come down on the fell. There is no sun, no stars, no skyline. You have a first aid kit with a sewing needle in it, a head torch, and a magnetic clasp on your map case. Twenty minutes later a needle is turning slowly on a scrap of leaf in a puddle and settling, every time you nudge it, along the same line. You have made a compass.…
In this lesson
How a compass needle works
Magnetising a needle with a magnet
What you need
How
Why one direction only
Common mistakes
Magnetising a needle with a battery and wire
What it is
Why brief touches
Stroking a needle on silk, wool or hair: the weak method
When to use it
The floating needle compass (needle and leaf)
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The rest of this lesson is in the full course
Every module, practical and exam, self-paced and private, with a certificate at the end.
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